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Homework Help: Electrical potential

  1. Jan 27, 2005 #1
    point a is at a potentiall of +290...point b is at potential of -220...helium nucleus contains 2 neutrons and 2 protons...neutrons are electrically neutral...what kinetic energy does particle have after accelerating from rest at point a to b...in electron volts
     
  2. jcsd
  3. Jan 27, 2005 #2
    You should really show some working...

    I think this is how you should go about it.

    First, E = K + U. Then use conservation of energy, to find delta K, then use the kinetic energy work theorem.
     
  4. Jan 28, 2005 #3

    Andrew Mason

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    The potential difference between a and b is the energy/unit charge: ie. the energy that a unit charge gains in moving from a to b. The energy that a charge of e gains in moving through a potential difference of 1 volt is 1 eV. So what is the energy that a +2e charge gains in moving from a to b?

    AM
     
  5. Jan 28, 2005 #4
    Look at the post called "Electric Potential & Kinetic Energy " (just above yours). The methods for solving the problems are very similar...
     
  6. Jan 28, 2005 #5
    take a look at this thread

    https://www.physicsforums.com/showthread.php?t=61631
     
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